Comparison of coupling capacitors and the inverter filter in partial discharge phenomena on rotating machines supplied by IFDs

offline and online measurement of partial discharge phenomena is necessary to prevent induction machine from premature insulation failure. An inverter output includes pulses of voltage rapidly and it is known that this type of voltages lead to aged insulation and premature insulation failure. The reason is excessive voltage proportional to the rise time of the inverter and cable length. When the rise time is greater, the excessive voltage will be less. This can be done by putting a filter on the inverter output. In this paper, an online partial discharge signals measurement in rotating induction machine fed by inverters without placing the filter on the inverter output and use coupling capacitors with different capacities to assess and compare their impact on machine performance and partial discharge detection, is done. Finally the machine performance has been studied and is compared with the use of appropriate capacity of coupling capacitors and inverter filter at output of the inverter. The model of the rotating machine and power cable is in high frequency because is fed by an inverter in order to visualize the overvoltage and partial discharge phenomena and it was developed using simulation in Matlab Simulink.

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